As VP and LB use different execution strategies to arrive at solutions (explained on next page), one for logical information processing and the other for storage and retrieval of past information, they cannot be executed in optimized manner using the same resources. For the same reason, the evolutionary process has divided brain into two hemispheres.

In a majority of population, most VP operations (i.e. hierarchical storage and retrieval of past information) are processed in the right hemisphere and most LB operations (i.e. logical information processing) are processed in the left hemisphere of the brain (as that is not the case in the entire population, I'm using the terms VP and LB instead of using the terms right hemisphere and left hemisphere respectively).

Such distribution of functions is called lateralization of brain functions.

Roles of Each Hemisphere: The left hemisphere (in majority of population) is used for logical processing, which is involved in logical, repetitive, analytical, objective, detail oriented, condition based, rule based, factual, critical, orderly, systematic, etc. processing of experiences, as they don't actively need to consider any past experiences.

The right hemisphere is used for optimizing decisions made by the left hemisphere using a hierarchical database management system for past experiences, which is involved in creative, emotional, subjective, imaginative, thoughtful, holistic, artistic, introspective, etc. processing of experiences, as all such experiences actively need to consider one or more past experiences in one way or the other.

When required, VP also processes the current interaction with one or more past experiences for projecting (i.e. imagining) future interactions.

Even when frequently used information like common words and phrases, data from facial database, action subroutines, etc. and fixed information like rules, policies, days in a week, name of the current president, etc. are a part of past information, they are stored in the LB, as they do not need VP's hierarchical database. When VP requires such information while processing interactions, it is fetched from LB.

When any interaction (or a part of it) becomes sufficiently repetitive, it gets transferred to the left hemisphere (i.e. LB). Though such interaction (or a part of it) is past information, it is processed in LB, which has random access capability to retrieve such data using its indexing and pattern matching capabilities in a parallel processing environment, making it drastically faster than VP, which works in serial processing environment.

Current brain science debunks the old view, which says that "people have either left-brain dominant or right-brain dominant personalities" and calling it a myth and pop-psychology pseudoscience.
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Such belief is chiefly based on a key study (mentioned below) which demonstrates that brain operations are not as lateralized as previously thought, which was mainly based on human split brain studies in the 1960s by Roger Sperry and his colleagues, which concluded that both hemispheres work in different ways independent of each other, giving the effect that the human brain has two minds - more under title DF Analysis and Effects of a Split-Brain.

The study analyzed brain scans of 1,011 people over a period of two years and concluded that though some brain functions occur in one or the other side of the brain (e.g. language tends to be on the left, attention more on the right), there is no evidence (within brain imaging studies) that indicates some people are right-brained or left-brained.

The study was inherently flawed. Not only are brain functions fully lateralized, one of the main reasons for having two hemispheres in the brain is to enable such lateralization, as explained on the website brainduality.com.

Though logical, analytical, detail oriented, etc. experiences are processed in the left hemisphere and creative, emotional, artistic, etc. experiences are processed in the right hemisphere, because of the following reasons, it is not possible to detect such clear dichotomy between the hemispheres merely by detecting brain activity (on which their conclusion is based):

Although LB and VP dominantly use left and right hemispheres respectively, parts of interactions they process either utilize or get transferred to their hemispheric counterparts to save VP utilization time (more under title VP Utilization Time).

Example 1: When we use a new word while forming a sentence, it is handled by the right hemisphere (i.e. VP). When it becomes sufficiently repetitive, it gets transferred to the left hemisphere (i.e. LB). Such transfer makes available VP utilization time whenever the word is used again in future, so that it can handle other tasks, which is necessary as VP cannot multitask. In the cases where the word requires attention, it gets transferred back to VP.

A majority of words in our day-to-day communication are repetitive (e.g. the, be, to, of, hello, etc.), and thus, originate from left hemisphere (i.e. LB), which is found to be critical for speech.

What's more, when major portion of speech production is handled by the left hemisphere (most of it being repetitive), intonation, emphasis, etc. are handled by the right hemisphere, as they actively require retrieving past experiences (and sometimes future projections) to evaluate them.

In a nutshell: Typical speech production utilizes both hemispheres simultaneously for different purposes.

Example 2: When we learn to ride a bicycle, the left hemisphere (i.e. LB) keeps collecting balancing information every time we maintain the balance using real time balancing data supplied by VP (as physical actions are guided by VP) and stores it in accumulated form in LB memory (more under title LB information Accumulation).

To maintain balance in similar situations at later stages, LB recalls and utilizes such accumulated information. At the same time, if we start losing balance in a situation which was not accumulated earlier, LB hands over the balancing task to VP, upon success of which, LB adds such new balancing information to the balancing information accumulated so far (while also making it stronger).

In a nutshell: Any part of a novel interaction being executed by VP which becomes sufficiently repetitive transfers to LB to save VP utilization time. Any part of a repetitive interaction being executed by LB which needs attention transfers to VP to make a decision on further interaction.

Right hemisphere can perform logical processing operations, but in a limited capacity

Judgments are formed in the right hemisphere but are passed on for final logical scrutiny to the left

Problem solving works in both hemispheres, but in different capacities

Physical actions are executed from both hemispheres (opposite sides), but are controlled by LB (as given under title Handedness).

Structure of the Developing Brain: Even when the overall design of human brain has evolved over thousands of generations to optimize its operations, locations in each developing brain where different functions are processed are spontaneously navigated and distributed at the cellular level (unlike a static blueprint design) based on its usage patterns to maintain close proximities. Such close proximities help brain to optimize its operations by increasing processing speed and saving energy.

Keeping the above in mind, as relations between transferred repetitive and transferred novel experiences are typically same between both hemispheres, many functional areas in one hemisphere are a mirror of their counterparts.

As its optimization happens in real time, such effects also work dynamically, which is based on how each person processes different experiences, known as brain plasticity, and also the reason why the way brain of each person is organized, distributed, shaped, etc. is different.

The resulting microscopically complex design makes it difficult to identify many functional components of the brain using fMRI or other brain imaging techniques. It also makes the complexity of brain activity appear to be proportionate to billions of neurons and trillions of synapses it possesses, as evident in brain studies today.

The above shows how integrating the DOS model with current technologies can not only save billions of dollars, but thousands of man-hours spent on research, while offering more conclusive outcomes.